It was not too long ago, when I was building up a Leica system, that one could go to B&H or KEH and find literally pages and pages of listing for Leica lenses. Now there are few to choose from. Back then I picked up a pristine 35mm Summacron for around $1,600. Now the same lens in the same condition goes for around $2,400 to $2,600. I thought it was the introduction of the Leica M9 that was responsible for the higher demand and prices of Leitz lenses now. Just a theory.